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After seaching the forum without getting the right answer, I am asking here :

I just upgraded to GTX1070 on my I5 6500K (4.4 ghz OC) 8GO ram setup.

I am really pleased with my performance so far as I can sustain 60fps in almost all situations. Except that when I am on the ground looking around at buildings or others aircrafts, my FPS drop at around 45 - 50 fps and panning with Trackir becomes sluggish.

Is it a known issue that FPS get hit on the ground even with aircraft not powered? Or is there any settings I can tweak to avoid that?

Preload radius and trees are very hardware demanding, especially on only 8GB system. Note that even default "high" preset doesn't have them on max, that's for a reason.

To compare, I still use my old GTX780, with settings pretty much as Yours except for preload and trees, which I have at default high (6000 and 9000, if I recall correctly?). On single 1200p monitor that yields stable 60 all around, with drops to 50-few at Batumi and Senaki (two most fps hungry airbases on Caucasus map).

Also, Sparse Grid Supersampling has always been a frame murderer, though I don't know how much it should affect such a hefty card like 1070.

Preload radius and trees are very hardware demanding, especially on only 8GB system. Note that even default "high" preset doesn't have them on max, that's for a reason.

To compare, I still use my old GTX780, with settings pretty much as Yours except for preload and trees, which I have at default high (6000 and 9000, if I recall correctly?). On single 1200p monitor that yields stable 60 all around, with drops to 50-few at Batumi and Senaki (two most fps hungry airbases on Caucasus map).

Also, Sparse Grid Supersampling has always been a frame murderer, though I don't know how much it should affect such a hefty card like 1070.

Its his Graficcard, thats got 8GB, not his system. So preload should be set to max.

also if it's in multiplayer, if the server is already running a long time with a lot of players (from time to time they crash near airports) can cause a lot of FPS drops.

Best example i have is on the Bruning skies server, where after a few hours, novo has either a lot of wrecks there or player, and both things can lead to FPS drop, but once you're away from it, the FPS get again up and stable

FPS drop occurs at Kobuleti (Warthog proficiency mission 1.2.2 by Gliptal), when looking towards aircrafts on the parking and airbase buidings in the background. You can test as it is really the begining of the misson, Aircraft powered off. 2 F16 and one UAV are starting rightaway and taxi in front of my A10. There are a dozens of airplanes at the park I guess.

I confirm that I only have 8go RAM in my system. Also 8go vram in the GTX. I play only single player so I think 8go is sufficent. It seems it uses around 60% of RAM during game.

I lowered water to low and dropped tree and preload radius a little. It is better but it seems that no matters what I lowers, I have this FPS drop from 5 to 10 below 60. It is sufficient to induce stutters because of Vsync (if I do not use Vsync I have screen tearing).

I guess I must live with it, if it is only at parking, it may not be a big deal. I thinks it is rather inherent to game optimization.

PS Is Windows task manager good enough to monitor RAM usage or do you advice another utility for that?

Kobuleti is known as frame rate hungry and I guess with AI moving around even more. The tearing is a different story and the stutters. Thats not a simple frame-rate issue. The human eye takes every rate above 30 as "smooth", so your issue is something else.

Just a thought: did you try it with NVidia inspector settings to stock? Sparse Grid SS killed me on my old system flying FSX there.
With my actual system I do not use Nvidia tuning anymore.